Painting plan

[steveo3002]

why do u not wet sand the primer?

you can , its been done for years

dry is the better choice as theres no chance the primer will soak up moisture

 

[langy]

Because primer takes in moisture mate.

why do u not wet sand the primer?

 

[Grrrmachine]

Sounds like your using cheap paper ??? Use freecut and its should be much better

I use what I can get over here, the market's not developed enough to be choosy about these sorts of supplies.

Part of the issue is that I'm rubbing down some quite serious orange peel from a spattered first coat, so i'll take off the peaks with 320 and then move down to 600 and see how it goes. It can't make the current coat much worse.

 

[langy]

I see, knock it down roughly with something coarser 220-240 and then finish with 400 then 600.
The idea is that as you get finer with the paper it removes the scratches the previous paper put in.

I use what I can get over here, the market's not developed enough to be choosy about these sorts of supplies.

Part of the issue is that I'm rubbing down some quite serious orange peel from a spattered first coat, so i'll take off the peaks with 320 and then move down to 600 and see how it goes. It can't make the current coat much worse.

 

[rs-tom]

so i should dry sand my guide coat 800 grit?

 

[langy]

Yep

so i should dry sand my guide coat 800 grit?

 

[Jack155Q4]

.be aware da pad grits will be roughly half whats been quoted for wet sanding ...i.e 800wet = 400 dry

Hi Steveo,
Please could you clarify this for me before I go buying DA pads.

Can I use a DA wet?

If I am recommended to DA something with 240 dry - is that the same as 240 dry hand sanding?

Bit confused!

 

[langy]

If you use 400 on a DA it will be roughly equal to 600-800

Hi Steveo,
Please could you clarify this for me before I go buying DA pads.

Can I use a DA wet?

If I am recommended to DA something with 240 dry - is that the same as 240 dry hand sanding?

Bit confused!

 

[Jack155Q4]

Thanks...and all DA work is done dry right?

 

[Jack155Q4]

Because primer takes in moisture mate.

Does this mean you need to whack the top coat on in the same day or can I leave it a week?

 

[tux]

Should be OK for a week as long as it is indoors and its not too damp. If you start walloping water on it to wet sand, the primer can absorb the moisture and can lead to problems further down the line.

 

[langy]

Depends on temp really and surroundings, at the moment its pretty dry, I have primered panels in my shop for a few weeks occasionally but i run a dehumidifier. When i prime i seal with epoxy usually and never had a problem.

Does this mean you need to whack the top coat on in the same day or can I leave it a week?

 

[Jack155Q4]

I have sanded down a panel with P600 and some areas were back to metal (with a DA). I have etch primed these areas now. Do I need to W&D P600 the etched areas or should I use a different grade?

Secondly, same question for plastic primer - do I need to sand it?

 

[Jack155Q4]

Any advice guys?
Thanks

 

[langy]

You don't sand etch primer

I have sanded down a panel with P600 and some areas were back to metal (with a DA). I have etch primed these areas now. Do I need to W&D P600 the etched areas or should I use a different grade?

Secondly, same question for plastic primer - do I need to sand it?

 

[Jack155Q4]

Thanks.

Assume the same for plastic primer?